#include "../apue.h"
#include <sys/times.h>

static void pr_times(clock_t, struct tms *, struct tms *);
static void do_cmd(char *);

int main(int argc, char * argv[])
{
    int i;
    setbuf(stdout, NULL);
    for (i = 1; i<argc; ++i)
        do_cmd(argv[i]);
    exit(0);
}

static void do_cmd(char * cmd)
{
    struct tms tmsstart, tmsend;
    clock_t start, end;
    int status;

    printf("\ncmd: %s\n", cmd);
    if ((start = times(&tmsstart)) < 0)
        err_sys("times error");

    if ((status = system(cmd)) < 0)
        err_sys("system() error");

    if ((end = times(&tmsend)) < 0)
        err_sys("times error");

    pr_times(end - start, &tmsstart, &tmsend);
    pr_exit(status);

}

static void pr_times(clock_t real, struct tms * tmsstart, struct tms * tmsend)
{
    static long clktck = 0;
    if (clktck == 0)
        if ((clktck = sysconf(_SC_CLK_TCK)) < 0)
            err_sys("sysconf error");

    printf(" real: %7.2f\n", real / (double)clktck);
    printf(" user: %7.2f\n",
            (tmsend->tms_utime - tmsstart->tms_utime) / (double)clktck);
    printf(" sys: %7.2f\n",
            (tmsend->tms_stime - tmsstart->tms_stime) / (double)clktck);
    printf("child user: %7.2f\n",
            (tmsend->tms_cutime - tmsstart->tms_cutime) / (double)clktck);
    printf("child sys: %7.2f\n",
            (tmsend->tms_cstime - tmsstart->tms_cstime) / (double)clktck);
}
